diff --git a/src/mruby/initial.ml b/src/mruby/initial.ml
index 9bdbc21..3177b82 100644
--- a/src/mruby/initial.ml
+++ b/src/mruby/initial.ml
@@ -203,7 +203,7 @@ end
 bind ?r, system: true do
   unbind_all
   if CONFIG_FILE != ""
-    code = File.read("script.rb")
+    code = File.read(CONFIG_FILE)
     eval code
   else
     eval DEFAULT
@@ -211,7 +211,7 @@ bind ?r, system: true do
 end
 
 if CONFIG_FILE != ""
-  code = File.read("script.rb")
+  code = File.read(CONFIG_FILE)
   eval code
 else
   eval DEFAULT